Dewatered sludge solidifying agent

A curing agent and sludge technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of large engineering volume, secondary pollution, high cost, etc., to improve adsorption performance, improve particle size ratio, and reduce voids rate effect

Inactive Publication Date: 2012-04-11
江苏东方生态清淤工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method dehydrates and solidifies the sludge by adding solidification and cementitious materials such as cement and lime into the sludge slurry. This method has the following obvious disadvantages in large-scale dredging: first, the slurry must be continuously output during large-scale dredging, and all Cement and lime are mixed into the mud, and the project volume is too large to be completed in a short period of time; secondly, a large amount of silt cannot be mixed evenly with cement, lime and other cementitious materials, and serious secondary pollution will still be formed when the rain washes away; thirdly, To meet the solidification requirements, a large amount of cement and lime needs to be added, which is costly, and the total volume of waste after solidification increases; finally, the biocompatibility of the solidified product after such a large amount of cement and lime treatment is destroyed. , generally can only be landfilled, and resource utilization is difficult

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  • Dewatered sludge solidifying agent
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Examples

Experimental program
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Effect test

Embodiment 1

[0022] First prepare the dewatered sludge curing agent: its components include Portland cement, modified fly ash, fine sand, calcium sulfate; wherein the quality of modified fly ash is 7% of the quality of Portland cement, and the quality of fine sand It is 3% of Portland cement quality, and particle diameter is 0.63~1.25mm, and the quality of calcium sulfate is 1.4% of Portland cement quality; The preparation method of described modified fly ash is: fly ash at 280 Bake at ℃ for 70 minutes, and keep sealed before use.

[0023] Take 1 kg of the dewatered sludge solidifying agent prepared above and add it to 25 kg of dehydrated sludge. The mass percentage of the solidifying agent in the dehydrated sludge is 4%, and the water content of the dehydrated sludge is 40%. Stir the mixture evenly, and prepare three sets of standard models, which are cylindrical, with a diameter of 3.9 cm and a height of 8 cm. These three groups of models were respectively cured at room temperature for ...

Embodiment 2

[0025] First prepare the dewatered sludge curing agent: its components include Portland cement, modified fly ash, fine sand, calcium sulfate; wherein the quality of modified fly ash is 5% of the quality of Portland cement, and the quality of fine sand It is 1% of the quality of Portland cement, the particle size is 0.63 ~ 1.25mm, and the quality of calcium sulfate is 1% of the quality of Portland cement; the preparation method of the modified fly ash is as follows: fly ash at 320 Bake at ℃ for 45 minutes, and keep sealed before use.

[0026] Take 1 kg of the dewatered sludge solidifying agent prepared above and add it to 16.7 kg of dehydrated sludge. The mass percentage of the solidifying agent in the dehydrated sludge is 6%, and the water content of the dehydrated sludge is 50%. Stir the mixture evenly, and prepare three sets of standard molds. The molds are cylindrical, with a diameter of 3.9 cm and a height of 8 cm. These three groups of models were respectively cured at r...

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Abstract

The invention relates to a dewatered sludge solidifying agent which comprises silicate cement, modified fly ash, fine sand and calcium sulfate, wherein the modified fly ash accounts for 5-7wt% of the silicate cement, the fine sand accounts for 1-3wt% of the silicate cement, and the calcium sulfate accounts for 0.6-1.4wt% of the silicate cement. The preparation method of the modified fly ash comprises: baking fly ash at the temperature of 280-320 DEG C for 40-70 minutes, taking out for cooling, sealing and storing for later use, wherein and the use amount of the dewatered sludge solidifying agent is 2-10wt% of dewatered sludge, and the water content of the dewatered sludge is 30-60%. The dewatered sludge solidifying agent is suitable for solidifying modification of sludge generated in a water conservancy project, civil engineering and wastewater treatment, and has short solidification time; and the obtained modified soil has the advantages of high strength, small void ratio and no secondary pollution.

Description

technical field [0001] The invention relates to a curing agent for curing and modifying dewatered sludge, which belongs to the field of geotechnical materials. Background technique [0002] my country has a vast territory and is a country with a large amount of silt resources in the world. There is great potential for the development of silt recycling and comprehensive utilization. According to the survey and statistics of relevant departments, only domestic lakes and rivers have an annual collection volume of at least 70 million tons of silt, plus urban sewer silt, the total annual collection volume can be more than 10,000 tons. Collecting silt is beneficial to dredging rivers, preventing water eutrophication and purifying the urban environment, and the comprehensive utilization of silt can turn harm into benefit. [0003] Judging from the existing river and lake dredging projects in China, most of the landed mud is disposed of by solidification in the yard. This method d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 高扬罗荣彪倪守高王俊泽张国刚凌嘉穗朱伟
Owner 江苏东方生态清淤工程有限公司
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